INSOLUBLE CARBOHYDRATES OR 
literature of the pectin bodies—Continued. 
MARC. 
83 
| Properties. 
. Spe te Polariza- | Results of acid 
| Solvents. | Precipitants. fans hydrolysis. 
| | 
| 2 
BS eet Bae cio y nS: al sherallia a = Neuere ae Pentose sugars 
| and galactose. 
| | = 
"Ss roe Mone eae mera Re en ne) Se 
Water ....| Alcohol ...--. fe. ca) a ess Nahe eee oe 
| | 214.4°to | 
| pon BRIS 
==. 40 Coagulated  [a]pD = + | Arabinose-..- 
by pectase, | 82.3°and 
| limewater, | -188.2°. 
| sodium, hy- c 
| droxid fol- 
lowed by 
hydroc hlo- 
EVeG 1a C1 a: 
neutraland 
basic lead 
acetate, fer- 
ric chlorid, 
magnesium 
and ammo- | 
| nium sul- | 
phate. 
Se ORCS EOC aero ae [a] D = JSG Oe seer es 
188.2°. 
2 OER E Fe PES Dc RIN bate [ng Sear oe te Galactose and 
xylose. 
ohne pees eee a Sa ee 2 eS ae ae See ie ee 
} 
| 
PAM HEA CIOSOlUtIONS)|--- 52 .22-2-|--2c2 2 s22 7 nce 
solutions. 
SAUIEAMIS SE Sth 7 ACIG FSR SS tl aa ea | na ag 
Alkaline |....- IO pre emia] a Tans | ate ee ee he 
solutions. 
Petes era | fal Dp = + |e as sess 
186° to | 
300°. 
: | 
Meera eANCONO] x2. .|.°..--.-..2- ese ine eee ets 
| Other properties. 
Remarks. 
Coagulated by pec- 
| tase in presence 
| of salts of alka- 
line earth metals. 
Hydrogen to oxy- 
-genratioisnearly 
1 to 8. Combus- 
| tion figuresgiven. 
| Author considers 
that pectin may 
be regarded as a 
glucoside. 
Mucie acid formed. 
Pectin hydrol- 
yzed by malt 
diastase, not by 
saliva or emul- 
sin. 
Mucie acid formed. 
Hydrolyzed by 
malt diastase. 
| Prolonged treat- 
ment with alkali 
gave metapectic 
acid. Noprecipi- 
tate would form 
on acidifying. 
Prolonged boiling 
in dilute alkali 
gave a solution 
from which noth- 
ing would precip- 
itate on acidify- 
ing, metapectic 
acid having been 
formed. 
Forms easily solu- 
ble alkali salts. 
Yields up to 80 
per cent of mucic 
acid. 
Possesses a_ slight 
acid reaction. 
Pectins defined as 
bodies which dis- 
solve in water, 
yield mucie acid, 
coagulated by 
limewater, baryta 
water, and by pec- 
tase, and which 
are dextro rota- 
tory. 
| Discussion only; pec- 
tins may be ligno- 
cellulose free from 
incrusting mate- 
rials. 
| Discussion and mi- 
crosecopical work. 
Pectin a constant 
fundamental con- 
stituent in young 
tissues. 
